/*
* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
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*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
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* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
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*//*
* @OSF_COPYRIGHT@
*//*
* Mach Operating System
* Copyright (c) 1991,1990 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
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*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*//*
* Machine-dependent simple locks for the i386.
*/
#ifndef_I386_HW_LOCK_TYPES_H_
#define_I386_HW_LOCK_TYPES_H_/*
* The "hardware lock". Low-level locking primitives that
* MUST be exported by machine-dependent code; this abstraction
* must provide atomic, non-blocking mutual exclusion that
* is invulnerable to uniprocessor or SMP races, interrupts,
* traps or any other events.
*
* hw_lock_data_t machine-specific lock data structure
* hw_lock_t pointer to hw_lock_data_t
*
* An implementation must export these data types and must
* also provide routines to manipulate them (see prototypes,
* below). These routines may be external, inlined, optimized,
* or whatever, based on the kernel configuration. In the event
* that the implementation wishes to define its own prototypes,
* macros, or inline functions, it may define LOCK_HW_PROTOS
* to disable the definitions below.
*
* Mach does not expect these locks to support statistics,
* debugging, tracing or any other complexity. In certain
* configurations, Mach will build other locking constructs
* on top of this one. A correctly functioning Mach port need
* only implement these locks to be successful. However,
* greater efficiency may be gained with additional machine-
* dependent optimizations for the locking constructs defined
* later in kern/lock.h..
*/struct hslock {
uintptr_t lock_data;
};
typedefstruct hslock hw_lock_data_t, *hw_lock_t;
#definehw_lock_addr(hwl) (&((hwl).lock_data))
#endif/* _I386_HW_LOCK_TYPES_H_ */